Multiple parallel conductor for electrical machines and devices

ABSTRACT

Multiple parallel conductor for an electrical machine and process. The conductor includes a plurality of adjacent subconductors combined to form a subconductor bundle having an outer surface with a plurality of contiguous surface sections arranged in a longitudinal direction, and a flat protective insulation covering at least one of the plurality of surface sections. At least one of the plurality of surface sections remains uncovered by the flat protective insulation covering. A mesh sheathing further covers the plurality of surface sections.

CROSS-REFERENCE TO RELATED APPLICATIONS

This is a U.S. National Stage Application of International ApplicationNo. PCT/AT99/00014 filed Jan. 21, 1999 and claims priority under 35U.S.C. §119 of Austrian Patent Application No. A 328/98, filed on Feb.24, 1998.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a multiple parallel conductor for anelectrical machine, especially for a transformer, comprising of aplurality of adjacent, preferably mutually insulated subconductors whichare combined to form a bundle, and a method for producing such amultiple parallel conductor. Furthermore, the present invention relatesto a winding for an electrical machine, especially a transformercomprising a higher-voltage and a lower-voltage winding, comprising ofat least one multiple parallel conductor of the abovementioned type,wherein successive windings of the multiple parallel conductor orparallel-wound multiple parallel conductors are arranged axially and/orradially adjacently.

2. Discussion of Background Information

To improve the cooling of electrical conductors, multiple parallelconductors comprising a mesh-shaped wrapping are known. For example, amultiple parallel conductor consisting of a plurality of subconductorsor transposed conductors which is taped with a wide-meshed woven ribbonor meshed ribbon of polyester or a glass-filament/polyester mixturehaving a mesh-size of at least 2 mm is described in InternationalPublication WO95/30991 of the applicant. If necessary, the multipleparallel conductor and/or the woven or meshed ribbon is also impregnatedwith a partially crosslinked epoxy resin. Such a woven ribbon can beused for producing a solid compact conductor in which the subconductorsare in direct contact with the cooling medium. Due to these greatlyimproved cooling characteristics, a more compact and cost-effectiveconstruction of electrical machines and devices becomes possible. If amultiple parallel conductor of this type is processed in such a mannerthat individual windings or parallel-wound multiple parallel conductorslie directly against one another, there is a risk that the enamelinsulation of the subconductors becomes damaged due to friction and thatthis impairs the electrical characteristics of the winding. For thisreason, a multiple parallel conductor of this type is processed inpractice in such a manner that spacers are arranged between two adjacentmultiple parallel conductors.

Furthermore, from U.S. Pat. No. 3,098,113, an electrical conductor isknown which is surrounded completely by a major insulation which can beimpregnated with oil and a partial insulation which is impermeable toliquid, to enable impregnation with oil but at least partially toprevent penetration by water. The partial insulation impermeable toliquid, in turn, is provided with a sheathing which can be impregnatedwith oil. Having regard to a compact and solid conductor, this type ofdesign is disadvantageous since it requires double and triple insulatinglayers at least in sections. Furthermore, this conductor ischaracterized by comparatively poor cooling characteristics.

SUMMARY OF THE INVENTION

It is an aspect of the present invention to find a possibility, byfurther development of multiple parallel conductors of the typementioned above, of creating windings having an even higher spacefactor, in which impairment of the electrical characteristics can beavoided and, nevertheless, good cooling characteristics are achieved.Furthermore, it is an aspect of the invention to specify a method forproducing such a multiple parallel conductor and to create a possibilityfor producing windings comprising of at least one such multiple parallelconductor.

On the basis of the abovementioned multiple parallel conductor, thisaspect is achieved, according to the invention, in that above the outersurfaces of the subconductor bundle, a flat protective insulation isprovided which covers at least one surface section of the subconductorbundle and does not cover at least one further surface section of thesubconductor bundle, the surface sections being arranged next to oneanother referred to the longitudinal direction of the multiple parallelconductor, and that thereabove a mesh-shaped sheathing, e.g. a meshedribbon, a filament braiding or the like, is provided at least insections. In a method of the type according to the invention, it isaccordingly provided that a flat protective insulation covering at leastone side surface but not the entire circumference of the subconductorbundle is placed onto the subconductor bundle and that the subconductorbundle together with the protective insulation is provided with amesh-shaped sheathing. According to the invention, a winding comprisingof at least one multiple parallel conductor according to the invention,in which successive windings of the multiple parallel conductor orparallel-wound multiple parallel conductors are arranged axially and/orradially adjacently, is characterized by the fact that at least one sideface of the side faces, facing one another, of adjacent winding sectionsof the multiple parallel conductor is provided with flat protectiveinsulation. In an embodiment of the winding according to the inventionhaving a particularly high space factor, the side faces provided with aflat protective insulation are in direct contact with one another.

Due to the combination of a protective insulation with a mesh-shapedsheathing, both increased mechanical strength and higher dielectricstrength are achieved, so that the individual multiple parallelconductors of a winding can be arranged directly above one another ornext to one another without interposition of spacers, and withoutimpairing the electrical characteristics. Due to the free accessibilityof the surfaces, which are not in contact with one another, of themultiple parallel conductor to the cooling medium and the good coolingcharacteristics of a multiple parallel conductor provided with amesh-shaped sheathing, adequate cooling of the conductor or,respectively, of the winding is ensured. The space factor and,consequently, the production costs for a winding can thus be furtherreduced, and the operational reliability further increased, by thissolution according to the invention.

In a preferred embodiment of the multiple parallel conductor accordingto the invention, the protective insulation comprises one or more sidefaces and the edge areas, facing this side face or these side faces,respectively, of the adjacent side faces not provided with protectiveinsulation and, if necessary, the edge areas between adjacent side facesprovided with protective insulation. This provides for increasedprotection of the conductor in the area of the edges so that thedielectric strength can be further increased.

In a winding in which adjacent multiple parallel conductors are incontact with one another over two side faces, e.g. in a group of four,the protective insulation preferably covers at least two adjacent sidefaces of the multiple parallel conductor in order to provide forall-round protection of the multiple parallel conductor.

The flat protective insulation is preferably paper insulation which, dueto its good insulation characteristics and the small space requirement,is excellently suitable for the purposes of the present invention.

A multiple parallel conductor for an electrical machine includes aplurality of adjacent subconductors combined to form a subconductorbundle having an outer surface with a plurality of contiguous surfacesections arranged in a longitudinal direction, and a flat protectiveinsulation covering at least one of the plurality of surface sections.At least one of the plurality of surface sections remains uncovered bythe flat protective insulation covering. A mesh sheathing further coversthe plurality of surface sections.

According to a feature of the invention, the electrical machine can be atransformer. Further, the subconductors may each be mutually insulated.The plurality of contiguous surface sections may have flat surfaces.Further, the mesh sheathing may include meshed ribbon or filamentbraiding. Moreover, the protective insulation covers a plurality ofadjacent surface sections of the plurality of surface sections.

In accordance with another feature of the invention, the flat protectiveinsulation can include an insulation material impregnated with oil.Further, the insulation material may include paper insulation. Thesubconductors can be enameled insulated.

The present invention is directed to a method for producing a multipleparallel conductor for an electrical machine that includes combiningindividual subconductors to form a subconductor bundle having aplurality of surface sections, positioning a flat sheet of protectiveinsulation substantially near the outer surface of the subconductorbundle to cover at least one surface section, but not an entirecircumference of the subconductor bundle, and covering the subconductorbundle and the protective insulation with a mesh-shaped sheathing.

According to a feature of the invention, the protective insulation mayinclude an insulating material impregnated with oil. Further, theinsulating material may include paper.

The protective insulation can be bonded to the subconductor bundle.

The present invention is directed to a winding for an electrical machinethat includes a plurality of multiple parallel conductors including aplurality of adjacent subconductors combined to form a subconductorbundle having an outer surface with a plurality of contiguous surfacesections. A flat sheet of protective insulation covers at least one ofthe plurality of surface sections. At least one of the plurality ofsurface sections remains uncovered by the flat protective insulationcovering. A mesh sheathing covers the plurality of surface sections.Successive windings of the multi-parallel conductors are arranged atleast one of axially and radially adjacent each other, such that atleast one side face of adjacent side faces is covered with theprotective insulation.

According to a feature of the present invention, the at least one sideof the plurality of surface sections covered by the flat protectiveinsulation of each bundle are arranged so that they face each other withrespect to the interfaces formed between the plurality of multipleparallel conductors.

The present invention is directed to a transformer that includes ahigher voltage winding and a lower voltage winding. Each windingincludes a plurality of multiple parallel conductors having a pluralityof adjacent subconductors combined to form a subconductor bundle havingan outer surface with a plurality of contiguous sides. A flat sheet ofprotective insulation covers at least one of the plurality of contiguoussides. At least one of the plurality of adjacent sides remains uncoveredby the flat protective insulation covering. A mesh sheathing furthercovers the plurality of contiguous sides. The plurality of multipleparallel conductors are arranged contiguous to each other, and a topsurface of the lower voltage winding facing an interface betweenadjacent the higher voltage winding and the lower voltage windingincludes the protective insulation.

The present invention is directed to a multiple parallel conductor foran electrical machine including a plurality of insulated subconductorscombined together to form a bundle. The bundle is formed with aplurality of flat sides contiguously connected to enclose the pluralityof insulated subconductors. A flat protective insulation sheet enclosedwithin the bundle, is positioned substantially near an outer perimeterof the bundle, and covers at least one of the plurality of flat sides ofthe bundle. A mesh-shaped sheathing covers the bundle.

In accordance with a feature of the present invention, the plurality ofsubconductors can have rectangular-shaped cross-sections. Moreover, theplurality of subconductors can be positioned adjacent to each other andstacked upon each other to form an array or matrix in regards to thepositioning of the plurality of subconductors within the bundle.Further, the plurality of subconductors are arranged in an array ormatrix comprising rows and columns. The row can include at least twosubconductors adjacent to each other, the columns can include at leasttwo subconductors stacked upon each other. The matrix further mayinclude a top row that includes at least one subconductor offset withrespect to half the width of each subconductor, so that the at least onesubconductor is positioned on top of the interface between the columnsof the matrix.

The present invention is directed to a winding for an electrical machinethat includes a plurality of multiple conductors having a plurality ofinsulated subconductors combined together to form a bundle. The bundleis formed with a plurality of flat sides contiguously connected toenclose the plurality of insulated subconductors. A flat protectiveinsulation sheet enclosed within the bundle is positioned substantiallynear an outer perimeter of the bundle, and covers at least one of theplurality of flat sides of the bundle. At least one of the plurality offlat sides remains uncovered by the flat protective insulation. Amesh-shaped sheathing covers the bundle. The plurality of multipleconductors are arranged at least one of stacked upon each other, andarranged side by side, to form an array or matrix.

According to a feature of the invention, the flat protective insulationsheet enclosed within each bundle is arranged to be positioned on theflat sides of the bundles which form the interfaces between the array ofmatrix.

Other exemplary embodiments and advantages of the present invention maybe ascertained by reviewing the present disclosure and the accompanyingdrawing.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention is further described in the detailed descriptionwhich follows, in reference to the noted plurality of drawings by way ofnon-limiting examples of exemplary embodiments of the present invention,in which like reference numerals represent similar parts throughout theseveral views of the drawings, and wherein:

FIG. 1 shows a multiple parallel conductor according to the inventioncomprising protective insulation on the top,

FIG. 2 shows a multiple parallel conductor according to the inventioncomprising protective side insulation,

FIG. 3 shows a multiple parallel conductor according to the inventioncomprising L-shaped protective insulation,

FIGS. 4a, 4 b show a winding of the type according to the invention, inwhich individual windings of the multiple parallel conductor or ofparallel-wound multiple parallel conductors are axially and/or radiallyadjoining,

FIG. 5 shows a winding of the type according to the invention, in whichindividual windings of the multiple parallel conductor or ofparallel-wound multiple parallel conductors are axially directlyadjoining via a part of the winding but are spaced apart in theremaining part.

DETAILED DESCRIPTION OF THE PRESENT INVENTION

The particulars shown herein are by way of example and for purposes ofillustrative discussion of the embodiments of the present invention onlyand are presented in the cause of providing what is believed to be themost useful and readily understood description of the principles andconceptual aspects of the present invention. In this regard, no attemptis made to show structural details of the present invention in moredetail than is necessary for the fundamental understanding of thepresent invention, the description taken with the drawings makingapparent to those skilled in the art how the several forms of thepresent invention may be embodied in practice.

In the text which follows, reference is made to FIG. 1 in which amultiple parallel conductor 1 for an electrical machine is shown usingthe example of a transposed conductor for the lower-voltage winding of atransformer. The multiple parallel conductor exhibits a number ofsubconductors 2, e.g. flat copper conductors having a rectangular crosssection.

Each subconductor 2 is provided with insulation 3, in the present casean enamel coating. To manufacture the multiple parallel conductor, theindividual subconductors 2 are combined in the required number andalignment to form a subconductor bundle.

In the present illustrative embodiment, protective insulation 4 whichcovers the entire top and the edge areas of the side faces facing thistop is arranged on the top of the subconductor bundle. The side facesand the underside of the subconductor bundle remain without protectiveinsulation. The material selected for the protective insulation isinsulating material which can be impregnated with oil, preferably paper,in the required quality and thickness.

To achieve the required solidity, the arrangement of the subconductorbundle with the protective insulation is wrapped with a wide-meshedribbon 5. Further information relating to the meshed ribbon 5 can befound in the International Application WO95/30991 of the applicantquoted at the start, which must be expressly considered as part of thepresent disclosure.

In the context of the present invention, all other means for stabilizinga subconductor bundle which are known to the person skilled in the artand in which the cooling medium is in direct contact with at least oneside face of the subconductor bundle can naturally be used instead ofthe abovementioned meshed ribbon 5, e.g. cross-sheathing with filaments.

FIGS. 2 and 3 show further illustrative embodiments of the multipleparallel conductor according to the invention, by a transposed conductorfor the lower-voltage or medium-voltage winding of a transformer. In thedescription following, identical reference symbols are used for the samefeatures and these are no longer expressly explained.

In the multiple parallel conductor 1 of FIG. 2, the protectiveinsulation 4 is arranged on one side face and a part-section of the topfacing this side face, this protective insulation preferably alsoextending over the adjoining edge areas. The remaining section of thetop, the underside and the opposite side face are without protectiveinsulation.

In the illustrative embodiment of a multiple parallel conductor 1according to the invention and according to FIG. 3, the protectiveinsulation 4 extends over one side face and the entire top of themultiple parallel conductor 1, wherein again the adjoining edge areasare preferably also enclosed. The opposite side face and the undersideremain without protective insulation.

The arrangement of the protective insulation according to theillustrative embodiments described above is not restrictive. Within thescope of the present invention, protective insulation can be arranged atany place and extend over any surface sections. Within the scope of thepresent invention, it is only provided that the protective insulationextends over at least one surface section (side face, top, underside)and leaves at least one surface section exposed.

Within the scope of the present invention, two or more protectiveinsulations can also be provided which, for example, can be arrangeddiametrically opposite or adjoining one another.

In a variant of the embodiment of a winding according to the invention,shown in FIG. 4a, the side faces, which are in contact with one another,of two or more multiple parallel conductors 1 are each provided withprotective insulation 4 in order to further increase the dielectricstrength of the winding.

In another winding, not shown, the multiple parallel conductors can alsobe arranged directly to one another in a radial direction offset by 90°,instead of in the axial direction. In this case, the protectiveinsulation is arranged at the vertical boundary faces between theindividual windings of the radial winding.

In a variant of the embodiment of a winding according to the invention,shown in FIG. 4b, only a part of the side faces, which are in contactwith one another, of two or more multiple parallel conductors isprovided with a flat protective insulation 4.

FIG. 5 shows a winding 6 for a transformer which is produced by amultiple parallel conductor 7 which is constructed as a so-calledtransposed conductor, which consists of a large number of subconductors2.

In the illustrative embodiment shown, the individual windings of themultiple parallel conductor 7 are arranged above one another in theaxial direction, a number of windings being directly in contact with oneanother and a number of windings being spaced apart by means of spacers(not shown) in order to be able to construct between the windingscooling channels for the cooling medium, e.g. oil, which are shown bymeans of arrows in FIG. 5.

The multiple parallel conductors 7 constructed in accordance with theinvention are arranged in such a manner that at least one multipleparallel conductor 7 is provided with protective insulation 4 at leastat one of the horizontal boundary faces via which the individualwindings are directly in contact with one another.

Naturally, such multiple parallel conductors 7 which are not in directcontact with adjacent windings can also be equipped with protectiveinsulation 4 according to the present invention in order to increase themechanical rigidity and the dielectric strength of the multiple parallelconductor. Such a multiple parallel conductor is shown at the top inFIG. 5.

Within the context of the present invention, multiple parallelconductors can also be wound together both in the radial and in theaxial direction, e.g. in groups of four (FIGS. 4a, 4 b). In this case,an L-shaped protective insulation is preferably provided (see also FIG.3) which extends both over a horizontal side face and a vertical sideface of each multiple parallel conductor.

It is noted that the foregoing examples have been provided merely forthe purpose of explanation and are in no way to be construed as limitingof the present invention. While the present invention has been describedwith reference to an exemplary embodiment, it is understood that thewords which have been used herein are words of description andillustration, rather than words of limitation. Changes may be made,within the purview of the appended claims, as presently stated and asamended, without departing from the scope and spirit of the presentinvention in its aspects. Although the present invention has beendescribed herein with reference to particular means, materials andembodiments, the present invention is not intended to be limited to theparticulars disclosed herein; rather, the present invention extends toall functionally equivalent structures, methods and uses, such as arewithin the scope of the appended claims.

What is claimed is:
 1. A multiple parallel conductor for an electricalmachine comprising: a plurality of adjacent subconductors arranged inplural adjacent layers to form a subconductor bundle, said bundle havingan outer peripheral surface including a plurality of contiguous surfacesections; a flat protective insulation extending over a portion of theouter peripheral surface of said bundle and covering at least one of theplurality of contiguous surface sections, wherein at least one of theplurality of contiguous surface sections remains uncovered by the flatprotective insulation; and a mesh sheathing covering the plurality ofcontiguous surface sections and the flat protective insulation, whereinthe mesh sheathing facilitates adequate cooling of the adjacentsubconductors.
 2. The multiple parallel conductor according to claim 1,wherein the multiple parallel conductor is adapted for use in atransformer.
 3. The multiple parallel conductor according to claim 1,wherein each of the plurality of subconductors is covered with aseparate insulation covering.
 4. The multiple parallel conductoraccording to claim 1, wherein each of the plurality of contiguoussurface sections includes a planar portion.
 5. The multiple parallelconductor according to claim 1, wherein the mesh sheathing comprises oneof meshed ribbon or filament braiding.
 6. The multiple parallelconductor according to claim 1, wherein the flat protective insulationcovers plural adjacent surface sections of the plurality of contiguoussurface sections.
 7. The multiple parallel conductor according to claim1, wherein the flat protective insulation comprises an insulationmaterial impregnated with oil.
 8. The multiple parallel conductoraccording to claim 7, wherein the insulation material comprises paperinsulation.
 9. The multiple parallel conductor according to claim 1,wherein each of the plurality of subconductors is covered with enamelinsulation.
 10. A winding for an electrical machine comprising: aplurality of multiple parallel conductors, each of the multiple parallelconductors including a plurality of adjacent subconductors arranged inplural adjacent layers to form a subconductor bundle, said bundle havingan outer peripheral surface including a plurality of contiguous surfacesections; a flat protective insulation extending over a portion of theouter peripheral surface of said bundle and covering at least one of theplurality of contiguous surface sections, wherein at least one of theplurality of contiguous surface sections remains uncovered by the flatprotective insulation; and a mesh sheathing covering the plurality ofcontiguous surface sections and the flat protective insulation; whereinsaid plurality of multiple parallel conductors are arranged adjacent toone another, such that at least one side face of a multiple parallelconductor which faces an adjacent multiple parallel conductor is coveredwith the flat protective insulation, and wherein the mesh sheathingfacilitates adequate cooling of the multiple parallel conductors. 11.The winding according to claim 10, wherein each side face of adjacentmultiple parallel conductors which face one another are covered with theflat protective insulation.
 12. Windings for a transformer whichincludes a higher voltage winding and a lower voltage winding, saidwindings each comprising: a plurality of multiple parallel conductors,each of the multiple parallel conductors including a plurality ofadjacent subconductors arranged in plural adjacent layers to form asubconductor bundle, said bundle having an outer peripheral surfaceincluding a plurality of contiguous surface sections; a flat protectiveinsulation extending over a portion of the outer peripheral surface ofsaid bundle and covering at least one of the plurality of contiguoussurface sections, wherein at least one of the plurality of contiguoussurface sections remains uncovered by the flat protective insulation;and a mesh sheathing covering the plurality of contiguous surfacesections and the flat protective insulation; wherein said plurality ofmultiple parallel conductors are arranged adjacent to one another, suchthat surfaces of the multiple parallel conductors of the lower voltagewinding which face the multiple parallel conductors of the highervoltage winding are covered with the flat protective insulation, andwherein the mesh sheathing facilitates adequate cooling of the multipleparallel conductors.
 13. A multiple parallel conductor for an electricalmachine comprising: at least two subconductor bundles positionedadjacent to one another, wherein each of said at least two subconductorbundles includes a plurality of adjacent insulated subconductorsarranged in plural adjacent layers, a plurality of contiguous flat sidesdefining an outer perimeter of each bundle, and a mesh sheathingcovering the outer perimeter of each bundle; and a flat protectiveinsulation sheet positioned outside of said outer perimeter of at leastone of said bundles to insulate a flat side of the at least one of saidbundles from an adjacent flat side of an adjacent bundle, wherein themesh sheathing facilitates adequate cooling of the adjacent insulatedsubconductors.
 14. The multiple parallel conductor according to claim13, wherein said plurality of subconductors have rectangular-shapedcross-sections.
 15. The multiple parallel conductor according to claim13, wherein said plurality of subconductors are positioned within saidbundles adjacent to one another and stacked upon one another in layersto form a matrix.
 16. A winding for an electrical machine comprising: aplurality of multiple parallel conductors, each multiple parallelconductor including at least two subconductor bundles positionedadjacent to one another, wherein each of said at least two subconductorbundles includes a plurality of adjacent insulated subconductorsarranged in plural adjacent layers, a plurality of contiguous flat sidesdefining an outer perimeter of each bundle, and a mesh sheathingcovering the outer perimeter of each bundle; and a flat protectiveinsulation sheet positioned outside of said outer perimeter of at leastone of said bundles to insulate a flat side of the at least one of saidbundles from an adjacent flat side of an adjacent bundle; wherein saidplurality of multiple parallel conductors are positioned adjacent to oneanother and stacked upon one another to form an matrix, and wherein themesh sheathing facilitates adequate cooling of the multiple parallelconductors.
 17. The winding for an electrical machine according to claim16, wherein said flat protective insulation sheet is arranged to bepositioned on said flat sides of said bundles which face adjacentmultiple parallel conductors of the matrix.
 18. A multiple parallelconductor for an electrical machine comprising: at least twosubconductor bundles positioned adjacent to one another, wherein each ofsaid at least two subconductor bundles includes a plurality of adjacentinsulated subconductors arranged in plural adjacent layers, a pluralityof contiguous flat sides defining an outer perimeter of each bundle, anda mesh sheathing covering the outer perimeter of each bundle; and a flatprotective insulation sheet positioned outside of said outer perimeterof at least one of said bundles to insulate a flat side of the at leastone of said bundles from an adjacent flat side of an adjacent bundle;wherein said plurality of subconductors are positioned within saidbundles in a matrix comprising plural rows and plural columns, each ofthe rows including at least two subconductors adjacent to one another,and each of the columns including at least two subconductors stackedupon one another; the matrix further including a top row that includesat least one subconductor offset with respect to half a width of eachsubconductor, so that said at least one subconductor is positioned ontop of an interface between the columns of the matrix, wherein the meshsheathing facilitates adequate cooling of the adjacent insulatedsubconductors.
 19. A multiple parallel conductor for an electricalmachine comprising: a plurality of adjacent subconductors arranged toform a subconductor bundle, said bundle having an outer peripheralsurface including a plurality of contiguous surface sections arranged ina longitudinal direction; and a flat protective insulation covering atleast one of the plurality of contiguous surface sections; said multipleparallel conductor including plural side faces; said flat protectiveinsulation extending over at least one of (a) an entire side face of atleast one of the plural side faces of the multiple parallel conductorand (b) over edge regions of adjacent side faces of the multipleparallel conductor, wherein at least one of the plurality of contiguoussurface sections remains uncovered by the flat protective insulation;and a mesh sheathing covering said bundle, wherein the mesh sheathingfacilitates adequate cooling of the adjacent subconductors.
 20. Themultiple parallel conductor according to claim 19, wherein the meshsheathing covers the plurality of contiguous surface sections and theflat protective insulation.
 21. The multiple parallel conductoraccording to claim 19, wherein the flat protective insulation extendsover at least two of the plural side faces of the multiple parallelconductor.